What Marion County, SC's soil rates for a septic system

Very limited

In Marion County, SC, 95.7% of the surveyed land carries a "Very limited" rating for a standard septic drain field. Expect the ground itself to work against a plain gravity system; USDA's strictest bucket alone covers 95.7% of the county. Marion County covers 489.372 square miles and counts 28,368 residents.

This is a county figure, not a parcel figure

USDA's survey covers the whole of Marion County, SC at once, not any single address. A site-specific perc test, usually $750-$1,850, is what a health department will actually require before permitting a lot in Marion County.

System cost, conventional vs. engineered

Given Marion County's rating, plan for the engineered-system range rather than the conventional one. The engineered-system range, $10,000-$40,000 (mound or aerobic treatment), is the more realistic number to plan around, against $3,000-$8,000 for a conventional system on the rare lot that passes.

How Marion County, SC compares

Nationally, Marion County, SC is the 566-most-constrained of 3,058 rated counties for septic soil. Within South Carolina alone it ranks 4 of 46.

Before you act on this

How this rating is built, and its real limits · Conventional vs. engineered septic systems